Sakiko's behavior with Tomori

Honestly, I really don't understand why Sakiko is acting in this ridiculous way towards Tomori, mistreating a person she knows very well is sensitive. Let's be honest, Tomori DID NOTHING, nothing wrong, ABSOLUTELY nothing... Tomori who was always caring about Sakiko. For me, Saki's actions towards Tomori (mainly) are completely unjustifiable, even though everything fell apart because of her father, unless someone here presents a better reason.

It doesn't seem to me at all that she is just protecting Tomori from the truth as some say, she destroyed something (CRYCHIC) that was the most important thing to Tomori and didn't even justify why to her.